If things are growing and you have polyp extension on your corals, then it is most likely to much nutrients in the water. When you have this situation, the corals take it all in, but the result is brown corals.
I don't know your friends feeding patterns for your fish and coral, but you can try reducing them.
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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